01 Record

CVE-2025-39703

net, hsr: reject HSR frame if skb can't hold tag

CriticalPUBLISHEDCNA: Linux

CNA base score9.8 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

View raw JSON

02 Description

net, hsr: reject HSR frame if skb can't hold tag

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.37% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 31.2% of scored records. A rank, not a probability.

NVD base score

5.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-10-19.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2025-09-05 17:21Z1 YR AGO

Last updated

2026-10-15 22:02Z13 DAYS AGO

Reserved

2025-04-16

Assigning CNA

Linux

Record state

PUBLISHED

Severity

Critical (CVSS 9.8)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-476NULL Pointer DereferenceBase
CWE-1286Improper Validation of Syntactic Correctness of InputBase

Data version

5.2

Document digest

c13eea09b7e679b430e53cee15ef69be509685b5d327d7e48393a5358f4f120c

05 Affected products

VendorProductVersionsPlatforms

LinuxLinuxf6442ee08fe66c8e45c4f246531a2aaf4f17a7a7 to < 8d9bc4a375a1ba05f7dfa0407de8e510ab9bd14d, 48b491a5cc74333c4a6a82fe21cea42c055a3b0b to < 3ae272ab523dd6bdc26e879027ed79feac9dd1b3, 48b491a5cc74333c4a6a82fe21cea42c055a3b0b to < b640188b8a6690e685939053c7efdbc7818b5f4e, 48b491a5cc74333c4a6a82fe21cea42c055a3b0b to < b117c41b00902c1a7e24347c405cb82504aeae0b, 48b491a5cc74333c4a6a82fe21cea42c055a3b0b to < acd69b597bd3f76d3b3d322b84082226c00eeaa4, 48b491a5cc74333c4a6a82fe21cea42c055a3b0b to < 61009439e4bd8d74e705ee15940760321be91d8a, 48b491a5cc74333c4a6a82fe21cea42c055a3b0b to < 7af76e9d18a9fd6f8611b3313c86c190f9b6a5a7, 4ffd1d4a6b306ff69cbe412d2c54d2dd349ff436, 5.10.42 to < 5.10.241, 5.12.9 to < 5.13, 5.13—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/8d9bc4a375a1ba05f7dfa0407de8e510ab9bd14d
git.kernel.orghttps://git.kernel.org/stable/c/3ae272ab523dd6bdc26e879027ed79feac9dd1b3
git.kernel.orghttps://git.kernel.org/stable/c/b640188b8a6690e685939053c7efdbc7818b5f4e
git.kernel.orghttps://git.kernel.org/stable/c/b117c41b00902c1a7e24347c405cb82504aeae0b
git.kernel.orghttps://git.kernel.org/stable/c/acd69b597bd3f76d3b3d322b84082226c00eeaa4
git.kernel.orghttps://git.kernel.org/stable/c/61009439e4bd8d74e705ee15940760321be91d8a
git.kernel.orghttps://git.kernel.org/stable/c/7af76e9d18a9fd6f8611b3313c86c190f9b6a5a7
lists.debian.orghttps://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
lists.debian.orghttps://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-032379.html

07 Fixed in

Debian 12

linux
Fixed in 6.1.153-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

linux
Fixed in 6.12.48-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

linux
Fixed in 6.16.5-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.